Apparatus for mixing and screening molders&#39; sand.



G. H. MARTIN.

, APPARATUS FOR MIXING AND SGREENING MOLDERS SAND.

APPLICATION FILED 0UT14,1910.

1438933., Patented M21123, 1914.

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G.'H. MARTIN.

APPARATUS FOR MIXING AND SGREENING MOLDERS SAND.

APPLICATION FILED 0OT.14, 1910 Patented Mar. 3, 1914.

'2 SHEBTS-SHEET 2.

UNITED STATES PATENT OFFICE.

GEORGE HENERY MARTIN, OF HORNELL, NEW YORK.

APPARATUS FOR MIXING AND SCREENING MOLDERS SAND.

T 0 all whom it may concern:

Be it known that I, GEORGE H. MARTIN, a citizen of the United States, residing at Hornell, in the county of Steuben and State of New York, have invented certain new and useful Improvements in Apparatus for Mixing and Screening Molders Sand; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to improvements in apparatus for mixing and screening sand for foundry use.

The primary object of the invention is to provide an improved apparatus of simple and inexpensive character which combines, in sequence, the two operations of theroughly mixing the sand and the oil or flour compound commonly employed as a. binder and of screening the resultant mixture for the purpose of removing lumps and extraneous matter.

A further object of the invention is to increase the efficiency of the mixing operation, and this object is accomplished by pro-- viding for the thorough breaking up of the sand continuously throughout the mixing operation.

An embodiment of the invention is illustrated by way of example in the accompanying drawings, wherein,

Figure 1 is a longitudinal central. section of an improved apparatus in accordance with the present invention. Fig. 2 is a detail perspective view partly in section,looking at the outside of the mixing cylinder. Fig. 3 is a similar view looking at the inside of the mixing cylinder and Fig. t is a front end elevation.

Similar characters of reference designate corresponding parts throughout the several views.

The mixing operation is preferably carried out by means of a cylinder, as 1. This cylinder is open at its front end and closed at its rear end by means of a plate, as 2. The cylinder is continually rota-ted by a shaft 3 which may be driven by power or by hand and which has suitable direct driving association with the cylinder, as for exampleby having its end keyed within a Specification of Letters Patent.

Application filed October 14, 1910.

Patented Mar. 3, 1914.

Serial No. 587,074.

central boss or hub 4; of the plate 2. The material to be mixed is introduced into the open end of the cylinder through a spout or funnel 5 which preferably flares outwardly both outside and inside of the cylinder as illustrated so that the flaring portion of the spout within the cylinder will spread the material toward the wall of the cylinder, said spout being suitably supported, for instance, by the head 5 of the cylinder.

In order that the cylinder may act in both of the operations aforesaid, viz., mixmg and screening, it is provided with suitably arranged openings 6 and means is further provided whereby all the openings may be closed as during the mixing operation or whereby all the openings may be uncovered as during the screening operation. In the embodiment shown, the openings 6 are arranged in transverse and circumferential alinement, and the means for controlling these openings in the manner set forth embodies transversely slidable plates 7. The plates correspond in relative arrangement to the transverse rows of openings and are provided with openings 8 which have the same transverse spacing as the openings 6 and which may be brought into or out of alineinent with the latter. The plates 7 are arranged on the outside face of the cylinder 1 and are held in position by suitably fashioned transverse guide strips 9 which are secured to said cylinder. The ends of the plates 7 project beyond the cylinder and are connected to a. flanged ring 10 which is dis posed co-axially of the cylinder and is axially movable. The axial movement of the ring 10 is effected by a hand lever 11 which is pivotably mounted at one side of the cylinder and is provided with a laterally directed fork l2, engaging over a peripheral bead of the ring 10.

The screening operation is rendered more eflicient by the provision of a sieve 13. This sieve is of frusto conical outline and con centrically surrounds the cylinder 1, its end of shorter diameter being secured to the rear end of said cylinder and its end of longer diameter being adjacent to and spaced from the forward end of said cylinder.

The mixing operation is rendered more efficient by the provision of inwardly projecting pins 1 1. These are arranged radially and are disposed in transverse rows between the transverse rows of openings 6 and in staggered relation to said openings.

The operation will be readily apparent from the foregoing description. The mixing operation is first carried on and accordingly the ring 10 occupies its innermost position in which case the openings 6 are all closed by the plates 7. Thereupon the material is introduced into the open end of the cylinder and the latter is rotated. The openings 6 are kept closed for such a period as may be necessary to insure of the thorough mixture of the material. The mixing operation is expedited and rendered more efficient by reason of the fact that the pins l t prevent to a great extent, the formation of lumps. After the material has been thoroughly mixed the ring 10 is moved outwardly. The plates 7 are of course moved with said ring to uncover the openings (5 whereupon the material passes through said openings 6 to the screen 13 which separates any lumps that may not have been broken up in the cylinder 1 and such extraneous matter as may be present or may have been collected during the previous use of the sand. The mixture passing through the screen 13 is caught upon the floor or in a suitable receptacle and the matter separated by the sieve 14L discharges through the larger end of the latter.

The invention is believed to be of con siderable novelty within its particular field for which reason no specific description herein contained is intended to put any limitation upon the scope of the succeeding claims, which does not inhere in the language thereof.

Having fully described my invention, I claim:

1. In a machine of the type set forth, a mixing cylinder having mixing elements and perforations arranged in rows, a series of separate plates disposed around the cylinder and having perforations which may be brought into or out of alinement with the perforations of the cylinder, said plates fitted to slide longitudinally of the axis of the cylinder, and means connected to the plates to produce simultaneous movements of the series of separate plates.

2. In a machine of the type set forth a mixing cylinder having perforations arranged in transverse rows, transverse plates fitted slidably to the outer face of the cylinder, corresponding in arrangement to the rows of perforations, and having perforations which may be brought into or out of alinement with the perforations of the cylinder, and an axially movable ring disposed coaxially of the cylinder and connected to the plates to produce simultaneous movements thereof in either direction.

3. In a machine of the type set forth, a movable mixer provided with mixing elements and having a perforated surface, a sieve encircling and spaced from and connected to the mixer for movement therewitl and upon which the material passing through the perforations of the cylinder falls, and means for closing or uncovering the perforations to control the passage of the material from the mixer to the encircling sieve.

a. In a machine of the type set forth, a mixing cylinder having mixing elements thereon and having suitably arranged perforations, a sieve of frusto-conical outline attached to and concentrically suroundiug the cylinder to leare space a'ound the mixing cylinder increasing in depth from the rear of the cylinder toward its receiving end, and means for closing or uncovering the perforations to control the passage of the material from the mixer to the surround ing sieve.

5. In a machine of the type set forth, a mixing cylinder having perforations arranged in rows and teeth arranged in staggered relation on the inside of the cylinder between the rows of perforations, a frustoconical sieve surrounding said cylinder and forming a space around the cylinder increasing in depth from the rear to the front of the cylinder, a series of apertured plates between the cylinder and inclosing cylinder and slidable axia ly of the cylinder, a plate being provided for each row of perforations in the cylinder, guides secured to the outside of the cylinder for each one of the plates, and means connected with the plates for moving the series in unison, substantially as described.

In testimony whereof I afix in presence of two witnesses.

GEORGE HENERY Witnesses EDWARD J. DAVIS, CHARLES J. DEHAVEN.

my signature M ZLRTIN.

Gopies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

